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The Refinery Sector Rule was promulgated on December 1, 2015 (80 FR 7178). On July 13, 2016, EPA extended the compliance date for maintenance vent requirements in the MACT subpart CC to August 1, 2017, in response to petitions for reconsideration. Additionally, most refiners sought and were granted 1- year extensions to comply with these provisions until August 1, 2018, under the compliance extension procedure in 40 CFR 63.6(i). This action would extend the date for refiners to comply with maintenance vent requirements in the MACT subpart CC from August 1, 2017, to January 30, 2019. The EPA is amending the compliance date because petroleum refiners have expressed challenges complying with the final rule requirements.